[i18n] Correcting forward & vacation menu floating in RTL

[Chuck Hagenbuch]

Quoting persian-horde at metanetworking.com:

> Because we have tested this before, but if you insert '#menu li' to
> rtl/screen.css you will see very bad and surprizing effects in menue
> elements like disappearing them !!!.
> The previous patch is only way that have correct effects in Mozilla and IE.

Alright. It's ugly, but I've committed it for now.

-chuck

-- 
"But she goes not abroad in search of monsters to destroy." - John 
Quincy Adams